Chain wrench.



F. H. DIGKSON.

CHAIN WRENCH.

APPLIOATION FILED 1 312.19, 1912.

1,023,198. Patented Apr- 16,1912.

0.... Q I o 6 1 WITNESSES 6 1+ COLUMBIA PLANOORAPH 60.,WASHINQTON, n. c.

FRANK H. DICKSON, 0F OSWEGO, NEW YORK.

CHAIN WRENCH.

Specification of Letters Patent.

Patented Apr. 16, 1912.

Application filed February 19, 1912. Serial No. 678,444.

To all whom it may concern:

Be it known that I, FRANK H. DICKSON, a citizen of the United States,residing at Oswego, in the county of Oswego and State of New York, haveinvented certain new and useful Improvements in Chain Wrenches;

and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to an improvement in chain wrenches.

Heretofore chain wrenches comprising a handle, jaws secured to thehandle, and a link chain connected to the handle, have been providedwith lugs or hooks, either on the jaws or on the handle in such positionas-to engage the links of the chain, or pintles connecting thelinksfafter the chain has been passed around the pipe or other articleto be turned, to secure the chain in position to effect the properworking of the wrench. Such constructions are objectionable for thereason that if the chain holding lug or hook through which all thepulling strains are transmitted, should break, the tool will beinoperative until the jaw or handle, which are the most expensive partsof the tool, has been replaced.

The object of my invention is to so construct and connect the parts thatall strains on the jaws are transmitted directly to the handle, thescrews connecting the jaws to the handle operating merely to hold thesaid parts together.

A further object is to provide parts independent of the jaws and handle,with lugs or hooks adapted to engage pins projecting from the chains,for locking the chain around a pipe or other object, so that in theevent of the breakage of a lug or hook, it can be replaced quickly andat a comparatively small cost.

With these and other objects in view my invention consists in the partsand combinations of parts and in the details of construction as will bemore fully described and pointed out in the claims.

In the accompanying drawings, Figure lis a view in elevation partly insection of my improved wrench. Fig. 2 is a View in plan of same. Fig. 3is a View in transverse section taken through the center of the jaws inrear of the bolt on which the chain is carried. Fig. 4 is a view of oneof the jaws. Fig. 5 is a similar view of one block and Fig. 6 is a viewof the handle.

1 represents the jaws, each of which is oval in shape, and provided withteeth or serrations at both ends sothat the wrench may be used eitherside up and the jaws may be reversed, end for end. Each jaw is providedon its inner face with a recess 2. of approximately the shape of thejaw, and each flange or wall 3 bordering the recess, is cut awaycentrally at both edges of the jaw, as at 4.

5 are blocks, one for each jaw, provided adjacent their front ends withangular projections 6, one projecting upwardly and the other downwardlyand resting respectively in the recesses 4 of the flanges 3 on the innerfaces of the jaws. The portion of the blocks in rear of the angularprojections 6 are shaped to conform to the recesses in the jaws so thatwhen the parts are assembled, the jaws are held in place by the walls ofthe recesses in the jaws bearing against the blocks and not bythe bolts,the latter serving merely to hold the parts in position.

The rear face of each angular projection on the block is shaped to forma hook 7, with which the projecting pintles on chain 8 engage as will behereinafter explained, and each block is provided on' its inner facewith an angular recess extending throughout the length of the block toreceive the angular end 9 of the handle 10. The angular end of thehandle rests between the two blocks, and within the angular recesses insaid blocks, and the blocks rest within recesses in the jaws, hence itwill be seen that all strains or stresses imparted to the jaws istransmitted directly to the handle through the blocks, and not throughthe bolts.

The jaws, blocks and handle are secured together by two bolts 11 and 12,one of which, 11, passes through both jaws and blocks and through thehandle, and the other 12, through both jaws and blocks in advance of thefront end of the handle and in advance of the centers of the jaws. Bothbolts are preferably threaded on both ends and secured in place by nuts.

Mounted on the bolt 12, is the link 13 to which the chain 8 is secured.The chain may be composed of fiat links connected by pintles 14 whichlatter project at both sides of the chain so as to engage the hooks 7,which as before explained, are formed in the rear faces of the angularprojections 6 of the blocks 5, or they may be composed of ordinarylooped links as shown in Fig. 2. When the latter form of chain is usedthe rounded end of a link will engage the two hooks and lock the chainin place.

The inner or adjacent faces of the blocks are separated sufiiciently forthe reception of the links of the chain but not for the pintles 14, thehooks 7 being of a size and shape to enter between the two pintles of alink or between two links of an ordinary looped link chain and engage,vthe rear pintle or end of the next link thus locking the chain againstthe possibility of accidental displacement after it has been placedaround a pipe or other object and put under tension.

In the use of the wrench, the chain is passed around the pipe or otherobject to be turned, and secured as previously described to the books 7.The chain therefore holds the pipe or other object against the serratedfaces of the jaws, in such position that when the lever or handle isactuated, the teeth or serrations in the jaws will grip the pipe andturn the same in the well known manner.

It is evident that many slight changes might be resorted to in therelative arrangement of parts shown and described without departing fromthe spirit and scope of my invention. Hence I would have it understoodthat I do not wish to confine myself to the exact construction andarrangement of parts shown and described, but

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is

1. In a chain pipe wrench, the combination of a handle, two blocks eachrecessed to receive one end of the handle and each provided with twohooks, two jaws each recessed on its inner face to form seats for theblocks, two bolts, one passing through both jaws and blocks and thehandle and the other through both jaws and blocks in advance of thehandle, and a chain mounted on said last mentioned bolt and adapted toengage the hooks'on the blocks.

2. In a chain pipe wrench, the combination of a handle, two blocks eachrecessed to receive the handle between them, and each block providedwith a projection shaped to form a hook,two jaws each recessed on itsinner face to receive one block and the projection from the latter, twobolts one of which passes through both jaws and blocks, and the handle,and the other through both jaws and blocks, and a chain mounted on saidlast mentioned bolt and adapted to engage the hooks on the blocks.

3. In a chain pipe wrench, the combination of a handle, two blocks, eachrecessed on its inner face to receive the handle between them, and eachprovided with two project-ions each of the latter shaped to form a hook,two double reversible jaws each recessed on its inner face to receive ablock, two bolts, one passing through both jaws, blocks and handle, andthe other through both jaws and blocks in advance of the handle, and achain mounted on said last mentioned bolt and provided with projectingpintles adapted to engage two oppositely disposed books on the blocks.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

FRANK H. DIOKSON. WVit-nesses A. W. BRIGHT, S. O. HILL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington. D. G.

